<template>
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <!-- active 指定激活项的索引 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form
        label-position="top"
        label-width="100px"
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
      >
        <!-- steps 中  active 只接受数字，tab-pane中的name是字符串 -->
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTableave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{
                  expandTrigger: 'hover',
                  label: 'cat_name',
                  value: 'cat_id',
                  children: 'children',
                }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableDate"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="item2"
                  v-for="(item2, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              v-for="item in onlyTableDate"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 
              action 表示图片要上传到的后台API 地址，要写全地址，不能简写
              :on-preview  指定预览事件
              :on-remove  点击 预览窗口的 关闭按钮的时候
              list-type="picture" 当前预览组件的呈现方式
             -->
            <el-upload
              :headers="headerObj"
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="hanleSuccess"
              list-type="picture"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">
                只能上传jpg/png文件，且不超过500kb
              </div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"> </quill-editor>

            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnEdit" @click="editBtn"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 预览框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewDialogVisible"
      width="50%"
    >
      <img :src="previewPath" alt="" class="previeImg" />
    </el-dialog>
  </div>
</template>
<style lang="less" scoped>
.el-steps {
  margin-top: 20px;
}
.el-checkbox {
  margin: 0 30px 20px 0 !important;
}
.previeImg {
  width: 100%;
}
.btnEdit {
  margin-top: 20px;
}
</style>
<script>
import _ from 'lodash'
export default {
  created() {
    this.getCateList()
  },
  data() {
    return {
      // 控制步骤条 激活 的索引
      activeIndex: '0',
      // 添加商品表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品分类的 值
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 富文本
        goods_introduce: '',
        attrs: [],
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      // 商品分类数据
      cateList: [],
      // 商品 的动态参数
      manyTableDate: [],
      // 商品的 静态参数
      onlyTableDate: [],
      headerObj: {
        // 图片上传组件的 请求头
        Authorization: window.sessionStorage.getItem('token'),
      },
      //  预览图片地址
      previewPath: '',
      previewDialogVisible: false,
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
  methods: {
    // 获取商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.$message.success('获取商品分类成功！')
      this.cateList = res.data
    },
    // 当商品分类 改变的时候
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
      console.log(this.addForm.goods_cat)
    },
    // 标签特切换之前触发的函数
    beforeTableave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
      console.log(activeName, oldActiveName)
    },
    // 当切换 标签页 的时候 触发的函数
    async tabClicked() {
      // 访问 动态参数 面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品动态参数失败')
        }
        this.$message.success('获取商品动态参数失败成功！')
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableDate = res.data
        console.log(res.data)
      }
      // 访问 商品  静态属性 面板
      if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品动态参数失败')
        }
        this.$message.success('获取商品动态参数失败成功！')
        this.onlyTableDate = res.data
        console.log(res.data)
      }
    },
    //  处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
    },
    //  点击 X  的时候
    handleRemove(files) {
      // 获取 将要删除的图片临时 路径
      const filePath = files.response.data.tmp_path
      // 从 pics 数组中，找到这个图片对应的索引值
      const index = this.addForm.pics.findIndex((x) => {
        if (x.pic === filePath) {
          return x
        }
      })

      // 调用数组的 splice 方法 删除
      this.addForm.pics.splice(index, 1)
    },
    // 监听图片上传成功
    hanleSuccess(response) {
      // 先拼接 得到一个 图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将对象 push到 pics 数组
      this.addForm.pics.push(picInfo)
    },
    // 添加
    editBtn() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！！')
        }
        // 执行添加的业务逻辑
        // goods_cat 服务器接收的是 字符串，而我们现在存储的是 数组
        // this.addForm.goods_cat = this.addForm.goods_cat.join(',')
        //  这样写完 预览的时候就会报错，因为级联选择框 必须是 数组，而我们是转换成了字符串，又因为是双向绑定的

        // 正确 做法
        // lodash  cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数 和 静态属性
        this.manyTableDate.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' '),
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableDate.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          }
          this.addForm.attrs.push(newInfo)
        })
        // 拷贝完了， 得需要另加上
        form.attrs = this.addForm.attrs
        console.log(form)

        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          console.log(res)
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功！！')
        this.$router.push('/goods')
        console.log(res)
      })
    },
  },
}
</script>